Another trick with finding fares and car rentals, clear all your cookies and saved files from the web browser, or use another computer when doing multiple searches, especially from the same company. Say if you look up a trip from NY to Vega on Expedia, then a few hours go back, chances are the rates are higher. If you look up the same thing on a fresh computer, the rates are lower. I've tested this several times and was able to save like 15% on the trip costs not booking without searching again using another system.